More than a dozen people - including 14 students - were sent to the hospital after a Pennsylvania school bus flipped on its side in a hit-and-run accident involving four vehicles.

The Lancaster Mennonite school bus was taking students to school in East Lampeter Township on Wednesday morning when a sedan trying to pass two tractor-trailers and their escort vehicles hit the rear of one of the escort vehicles, the Lancaster County district attorney's office said.

According to the DA's office, the escort vehicle was pushed into the oncoming lane and sideswiped the bus around 8am, causing the bus to impact one tractor-trailer's load and tip onto its side, prosecutors said.

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A Lancaster Mennonite school bus (pictured) flipped on its side in a hit-and-run accident involving four vehicles, sending more than a dozen people, to the hospital, authorities said

The bus was taking students to school on Wednesday morning when a sedan trying to pass two tractor-trailers and their escort vehicles hit the rear of one of the escort vehicles (pictured)

According to the DA's office, the escort vehicle was pushed into the oncoming lane and sideswiped the bus around 8am, causing the bus to impact one tractor-trailer's load and tip onto its side, prosecutors said

The 14 students, the bus driver and another driver were taken to a hospital, where a spokesman said two students with trauma injuries were being transferred to children's hospitals.

Authorities said the others involved were treated and released from the hospital. One student was ejected from the bus and seriously injured.

Lancaster Mennonite spokesman Gary Hiller said the bus was carrying 12 high school students, one middle school student and one Locust Grove elementary student.

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'Our focus has been on the physical and emotional well-being of our students rather than the cause and who is responsible,' Hiller said. 'We express concern for the two who are still in the hospital.'

Authorities issued an alert for the newer-model light-colored sedan and its male driver, saying the vehicle was expected to have front-bumper damage.

'There's a very good possibility that this vehicle, as it was traveling eastbound prior to the accident scene, may have been passing other vehicles,' township police Chief John Bowman said.

The 14 students, the bus driver and another driver were taken to a hospital, where a spokesman said two students with trauma injuries were being transferred to children's hospitals

Authorities said the others involved were treated and released from the hospital. One student was ejected from the bus and seriously injured. Police are now searching for the male driver responsible for causing the crash